package com.cscp.javastudy.designpattern.proxy.demo4;


import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class ProxyInvocationHandler implements InvocationHandler {

    // 被代理的接口
    private Object target;

    public void setTarget(Object target) {
        this.target = target;
    }

    /**
     * 生成得到代理类
     * @return
     */
    public Object getProxy(){
        return Proxy.newProxyInstance(this.getClass().getClassLoader(), target.getClass().getInterfaces(),this);
    }

    /**
     * 处理代理实例并返回结果
     * @param proxy
     * @param method
     * @param args
     * @return
     * @throws Throwable
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        // 动态代理的本质就是使用反射机制
        log(method.getName());
        Object invoke = method.invoke(target, args);
        return invoke;
    }

    public void log(String msg){
        System.out.println("[INFO] >>>>>> 执行了 " + msg + "方法");
    }

}
